Poly(styrene-acrylonitrile) emulsion particles with positive charges on the surface were synthesized by emulsion polymerization using cationic surfactant octotyltrimethyl ammonium chloride (OTAC) as emulsifier.The suspension of montmorillonite was slowly dropped into the emulsion.Through the interaction between the negative charges on the montmorillonite layers and the cations on the surface of poly(styrene-acrylonitrile) particles, the montmorillonite layers and emulsion particles could assemble and absorb on each other by themselves.The change of δ voltage and particle size of the emulsion during the process of dropping was characterized, which demonstrated that the emulsion particles and montmorillonite layers absorbed on each other by the electrovalent bond and an intersectional structure was formed in the complex emulsion.Poly(styrene-acrylonitrile)/ montmorillonite nanocomposite was obtained after coagulation.The structure of nanocomposite was characterized with XRD and TEM.The results indicated that montmorillonite was exfoliated into layers with a thickness of several nanometers and uniformly dispersed in the polymer matrix.
采用马来酸酐接枝聚丙烯 (PP g MAH)及马来酸酐接枝乙烯 -1-辛烯共聚物 (POE g MAH )为界面相容剂 ,利用熔融共混法制备PP/镁盐晶须 (M HOS) /POE三元复合材料 ,研究了PP g MAH及POE g MAH的用量及配比、M HOS和POE的用量对三元复合材料力学性能的影响。结果表明 :当PP/M HOS/POE的质量比为 10 0 /10 /2 0时 ,PP g MAH的最佳用量为 3份 ;利用PP g MAH及POE g MAH作为复合相容剂可同时改善M HOS与PP和POE的界面相容性 ,促进POE、M HOS对PP的增韧补强作用 ,使三元复合材料的力学性能得到了明显的改善。
